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  4. Which of the following is most soluble in water?

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Q. Which of the following is most soluble in water?

AMUAMU 2018The s-Block Elements

Solution:

Higher is the hydration energy, more will be the solubility in water. If the cations have different charge then the one with higher charge will have higher hydration energy. Among $CsClO_{4}, NClO_{4}$ and $LiClO_{4}$ all of the cations have $+1$ charge, so for comparing hydration energy size factor will be considered Smaller is the size more will be the hydration energy. Thus, among all cations $Li^{+}$ is smallest in size. Hence , $LiClO_{4}$ is most soluble in water